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MICRF405 датащи(PDF) 15 Page - Micrel Semiconductor

номер детали MICRF405
подробное описание детали  290MHz-980MHz ISM Band ASK / FSK Transmitter
PDF  46 Pages
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производитель  MICREL [Micrel Semiconductor]
домашняя страница  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF405 датащи(HTML) 15 Page - Micrel Semiconductor

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Micrel
MICRF405
April 2006
15
M9999-041906
(408) 955-1690
How to transmit a Packet with the Packet Engine:
YES
NO
NO
YES
TURN on
PA
PLL IN LOCK?
[LD=”1"]
Send
data
CALL PROG
[TX]
PLL IN LOCK?
[LD=”1"]
NO
YES
INIT WRITE
SEQUENCE
[SET SEN=”0"]
INIT TX BUFFER
[WRITE ADDR 29,
R/W =”0"]
WRITE FRAME
LENGTH
i=0
RDY = falling
edge?
WRITE PAYLOAD
BYTE i
i=n?
END TX msg
sequence
[SEN=”1"]
CALL PROG
[Power down]
END
MICRF405 waits for
the PLL to lock;
LD=”1", Turns on PA
and waits for the PLL
to lock with PA on;
”LD=1", then start to
send Preamble,
SyncID and Frame
length.
PROG
INIT WRITE
SEQUENCE
[SET SEN=”0"]
WRITE CONTROL
WORD
[ADDRESS + R/W +
CONTROL WORD]
LOAD CONTROL
WORD
[SET SEN=”1"]
RETURN
Control word, e.g:
TX mode:
Mode1-0=3 [TX]
PA_LDc=”1"[Turns on PA
stage when PLL is in lock]
MOD_LDc_en=”1"
[Modulation starts once
frame length is written into
data byte and PA is turned
on and LD is high.]
PA_FEc_en=”1" [The PA is
turned off immediately after
last bit in packet is sent.]
Power down mode:
Mode1-0=0
MICRF405 INTERNAL PROCESS
i=1+1
NO
YES
Wait for [2 +
number of CRC
bytes] falling edge
of RDY. Then wait
1 bit periode.
MICRF405 starts the
XCO. When XCO is
stable the MICRF405
powers up the LDOs
and starts the PLL.
Figure 6. Flowchart of Transmitting a Packet Using the Packet Engine.



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